Process of making carbon and other coated papers



' Y A. HAIGH ET AL PROCESS OFMAKING CARBON AND OTHER COATED PAPERS Dec 1,

Filed Sept. 7, 1922 [/2 mam A [2 2 ad f/cu'gfi 4 f/Mflfi fa Va/z f/a/Lz Patented Dec. 1, 1925.

UNITED STATES PATENT orrica'.

PROCESS OF MAKING CARBON AND OTHER COATED PAPERS.

Application filed September 7, 1922. Serial No. 586,779.

To all whom it may concern:

Be it known that we, ALFRED HAIGH, a subject of the King of Great Britain, residing in Staffordshire, England, and HAROLD RAVEN HART, a subject of the King of Great Britain, residing in Staifordshire, England, have invented certain new and useful Improvements in Processes of Making Carbon and Other Coated Papers, of which the following is a specification.

This invention relates to improvements 1n and relating to carbon and other coated papers and carbonizing papers and refers primarily to the so-called carbon papers such as are used for duplicating purposes upon typewriting machines, in salesmens books, and for other purposes, and in which one or both sides or surfaces are coated with the desired composition.

.The present invention relates to papers of the above character in which only one side or surface is coated.

lhe term carbonizing paper used herein is intended to appy to theplain or untreated paper. v

7 1n the manufact ire of carbon papersas atpresent generally conducted the paper in the form of a continuous web of thin paper is first coated and afterwards out up into sheets of the desired dimensions.

111 view of the thinness of the paper a certain amount of care is required in the handling thereof in order to avoid tearing or damaging same, and further care is necessary to prevent the composition from getting upon that side of the paper which is to remain untreated.

Where a thin paper is employed such as that referred to it frequently happens that there are small holes in said paper through which the coating material will pass to the back of the sheet and extend more or less thereover, inwhich case not only does the paper stick to the rollers b1: the coating composition thus conveyed to the-rollers will setcfl or stain the paper which follows.

The present invention has for its object to overcome theaforesaid objections attending the present method of manufacture of carbon papers, and furth: to simplify and expedite the production of such paper.

In the co-pending application Serial No. 586,772, it has been proposed to employ two sheets of paper separably adhered together and to coat one or both of the-outer surfaces thereof, the second sheet preventing the passage of the coating substance to the back of the sheet or sheets as the case may be.

According to the present improvements in order to prevent the staining or marking of the backs of the coated sheets the said sheets may have interposed between them a third plain sheet or 1f desired two plain sheets may be interposed between those having the coated surfaces whereby each single carbon sheet may be provided with a backing or interleaving sheet separable from the coated sheets before use, and which sheets would also prevent set-off whilst the sheets were stored.

The composition can be applied first to one side of the paper and then to the other in two separate operations or both sides of the paper may be simultaneously coated by any of the methods employed or capable of bein employed for producing a double side carbon paper. By this means two carbon sheets may be produced instead of one, and. further any risk of the composition passing through holes in the paper and extending to the uncoated surface is prevented.

The papers may be all of the same weight paper may be heavier showing means for separating a quadru lex web, the outer sheets being coated on t eii outer surfaces andathc two intermediate or interleaving sheets being uncoated and sepa-- rately secured to the outer sheets and to each other.

Figure 2, is a fragmental sectional diagrammatic view, on an enlar ed scale, showing the separation of a dup ex web of 'carbon coated paper into two sheets coated on one of their surfaces.

Figure 3, is a fragmental sectional diagrammatic view, on an enlarged scale, showingthe separation of a web of coated paper consisting-of two sheets coated on their outer Elli surfaces and having between their inner urijcoated surfaces and separable therefrom an mtgrvening, or interleaving uncoated sheet, an

Figure 4, is a fragmental sectional dia.

grammatic view, on an enlarged scale, showmg the separation of a quadruplex web consisting of two sheets coated on their outer surfaces and two intermediate or interleaving uncoated sheets secured to the uncoated surfaces of the outer sheets and separable therefrom and from each other, the interme diate sheets being shownin course-of separation from each other and remaining secured to tlfe outer outer sheets. i

\ Similar reference characters denote simisheets for protecting the lar parts throughout the several views.

I I CC are wound upon the mandrels Referring to Fig. 1. and considering the web as consisting of two sheets represented by the full lines and coated on their outer surfaces and for purposes of explanation disregarding the dash and dot lines of the figure, theduplex web A is passed between the rolls BB, which are moved by the web, the sheets represented by the full lines being separated atthe nip between the rolls, as seen in Fig. 2, and passing around. the ulisle rolls Again referring to Fig.1, and considering the quadruplex web as consisting of two coated outer sheets shown in full lines and of two intermediate or interleaving un- --coated sheets shown by the dot and dash lines, the outer coated sheets A A are separated at the nip between the rolls BB and guided by the rolls CC are wound around I the mandrels DD, while the uncoated sheets 4 A, A are carried betweenthe rolls EE, and

webs, leaving a single. coated sheet which is guided and ggiind by the. rolls CC and the mandreis Referring to Fig. 3, the web consists of two coated outer sheets A A havin an intermediate or interleaving uncoated s eet A".

separably secured therebetween, the separationof the outer sheets from the intermediate sheet,being at the nip between rolls such as BB, the separated sheets being guided and wound as described for the duplex web, while. the intermediate sheet is carried around a single roll such as E and wound around a single" mandrel such as G, ,shown in Fig. 1.

The utility of the present inventionliesnot only in the reduction of cost when the two papers are coated together, but also in the greater easewith which the double paper is handled, and further in. that when this invention is used there is no possibility of surplus composition 'deposited accidentally on-the back or lain side of the pa er through pin holes in t e paper or otherwise.

Any other coating process, besides carbonizing may be. used or applied tothis paper.

Claims:

1. A process including moistening andsuperposing at least three webs of paper in intimate contact to cause the webs to cohere in a manner to permit ready se aration of the webs; and coating the expose face of the outside webs after the webs have been superposed, leaving the unexposed faces of the Webs uncoated.

2. A process including 'superposing at least four webs of paper in a manner to permit ready separation of the webs, the inner webs being thicker than the outer webs; and

coating the exposed face of one of the outside the unexposed faces ofthe webs uncoated.

In testimony whereof we. have hereunto set our hands. i

ALFRED HAIGH: HAROLD RAVEN HART. 

